package com.laizhenghua.wxstub.utils;

import com.laizhenghua.wxstub.service.impl.AssistantServiceImpl;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @description:
 * @author: laizhenghua
 * @date: 2022/9/4 21:39
 */
public class CalendarUtil {
    private static final org.apache.logging.log4j.Logger log = org.apache.logging.log4j.LogManager.getLogger(CalendarUtil.class);
    private static final Integer DAY_TIME_IN_MILLIS = 86400000; // 1000 * 24 * 60 * 60
    public static Long getRemainDay(String date) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
        Date now = new Date();
        String year = sdf.format(now);
        String dateStr = year + "-" + date;
        SimpleDateFormat parseSdf = new SimpleDateFormat("yyyy-MM-dd");
        Date time = null;
        try {
            time = parseSdf.parse(dateStr);
        } catch (Exception e) {
            log.error(e);
            return null;
        }
        long diff = time.getTime() - now.getTime();
        long day = diff / DAY_TIME_IN_MILLIS;
        if (day < 0) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(time);
            calendar.add(Calendar.YEAR, 1);
            diff = calendar.getTimeInMillis() - now.getTime();
            day = diff / DAY_TIME_IN_MILLIS;
        }
        return day;
    }
}
